#include <assert.h>
#include <getopt.h>
#include <bfd.h>
+#include <libiberty.h>
#include "sysdep.h"
#include "bucomm.h"
/* Internal BFD NLM header. */
static void alpha_mangle_relocs PARAMS ((bfd *, asection *, arelent ***,
bfd_size_type *, char *,
bfd_size_type));
+/* start-sanitize-powerpc-netware */
+static void powerpc_build_stubs PARAMS ((bfd *, asymbol ***, unsigned int *));
+static void powerpc_resolve_stubs PARAMS ((bfd *, bfd *));
+static void powerpc_mangle_relocs PARAMS ((bfd *, asection *, arelent ***,
+ bfd_size_type *, char *,
+ bfd_size_type));
+/* end-sanitize-powerpc-netware */
static void default_mangle_relocs PARAMS ((bfd *, asection *, arelent ***,
bfd_size_type *, char *,
bfd_size_type));
bfd *outbfd;
asymbol **newsyms, **outsyms;
unsigned int symcount, newsymalloc, newsymcount;
- asection *bss_sec, *data_sec;
+ asection *text_sec, *bss_sec, *data_sec;
bfd_vma vma;
bfd_size_type align;
asymbol *endsym;
|| ! bfd_set_section_alignment (outbfd, bss_sec, 1))
bfd_fatal ("make .bss section");
}
+/* start-sanitize-powerpc-netware */
+
+ /* For PowerPC NetWare we need to build stubs for calls to undefined
+ symbols. Because each stub requires an entry in the TOC section
+ which must be at the same location as other entries in the TOC
+ section, we must do this before determining where the TOC section
+ goes in setup_sections. */
+ powerpc_build_stubs (inbfd, &symbols, &symcount);
+/* end-sanitize-powerpc-netware */
/* Set up the sections. */
bfd_map_over_sections (inbfd, setup_sections, (PTR) outbfd);
+ text_sec = bfd_get_section_by_name (outbfd, NLM_CODE_NAME);
+
/* The .bss section immediately follows the .data section. */
data_sec = bfd_get_section_by_name (outbfd, NLM_INITIALIZED_DATA_NAME);
if (data_sec != NULL)
/* Force _edata and _end to be defined. This would normally be
done by the linker, but the manipulation of the common
symbols will confuse it. */
- if (bfd_asymbol_name (sym)[0] == '_'
+ if ((sym->flags & BSF_DEBUGGING) == 0
+ && bfd_asymbol_name (sym)[0] == '_'
&& bfd_get_section (sym) == &bfd_und_section)
{
if (strcmp (bfd_asymbol_name (sym), "_edata") == 0)
sym->section = bss_sec;
endsym = sym;
}
- }
+/* start-sanitize-powerpc-netware */
+ /* For PowerPC NetWare, we define __GOT0. This is the start
+ of the .got section. */
+ if (bfd_get_arch (inbfd) == bfd_arch_powerpc
+ && strcmp (bfd_asymbol_name (sym), "__GOT0") == 0)
+ {
+ asection *got_sec;
+
+ got_sec = bfd_get_section_by_name (inbfd, ".got");
+ assert (got_sec != (asection *) NULL);
+ sym->value = got_sec->output_offset;
+ sym->section = got_sec->output_section;
+ }
+/* end-sanitize-powerpc-netware */
+ }
/* If this is a global symbol, check the export list. */
if ((sym->flags & (BSF_EXPORT | BSF_GLOBAL)) != 0)
}
/* See if it's one of the special named symbols. */
- if (strcmp (bfd_asymbol_name (sym), start_procedure) == 0)
- {
- if (! bfd_set_start_address (outbfd, bfd_asymbol_value (sym)))
- bfd_fatal ("set start address");
- gotstart = true;
- }
- if (strcmp (bfd_asymbol_name (sym), exit_procedure) == 0)
- {
- nlm_fixed_header (outbfd)->exitProcedureOffset =
- bfd_asymbol_value (sym);
- gotexit = true;
- }
- if (check_procedure != NULL
- && strcmp (bfd_asymbol_name (sym), check_procedure) == 0)
+ if ((sym->flags & BSF_DEBUGGING) == 0)
{
- nlm_fixed_header (outbfd)->checkUnloadProcedureOffset =
- bfd_asymbol_value (sym);
- gotcheck = true;
+ bfd_vma val;
+
+ /* FIXME: If these symbols are not in the .text section, we
+ add the .text section size to the value. This may not be
+ correct for all targets. I'm not sure how this should
+ really be handled. */
+ if (strcmp (bfd_asymbol_name (sym), start_procedure) == 0)
+ {
+ val = bfd_asymbol_value (sym);
+ if (bfd_get_section (sym) == data_sec
+ && text_sec != (asection *) NULL)
+ val += bfd_section_size (outbfd, text_sec);
+ if (! bfd_set_start_address (outbfd, val))
+ bfd_fatal ("set start address");
+ gotstart = true;
+ }
+ if (strcmp (bfd_asymbol_name (sym), exit_procedure) == 0)
+ {
+ val = bfd_asymbol_value (sym);
+ if (bfd_get_section (sym) == data_sec
+ && text_sec != (asection *) NULL)
+ val += bfd_section_size (outbfd, text_sec);
+ nlm_fixed_header (outbfd)->exitProcedureOffset = val;
+ gotexit = true;
+ }
+ if (check_procedure != NULL
+ && strcmp (bfd_asymbol_name (sym), check_procedure) == 0)
+ {
+ val = bfd_asymbol_value (sym);
+ if (bfd_get_section (sym) == data_sec
+ && text_sec != (asection *) NULL)
+ val += bfd_section_size (outbfd, text_sec);
+ nlm_fixed_header (outbfd)->checkUnloadProcedureOffset = val;
+ gotcheck = true;
+ }
}
}
if (endsym != NULL)
- endsym->value = bfd_get_section_size_before_reloc (bss_sec);
+ {
+ endsym->value = bfd_get_section_size_before_reloc (bss_sec);
+
+ /* FIXME: If any relocs referring to _end use inplace addends,
+ then I think they need to be updated. This is handled by
+ i386_mangle_relocs. Is it needed for any other object
+ formats? */
+ }
if (newsymcount == 0)
outsyms = symbols;
nlm_version_header (outbfd)->year = ptm->tm_year + 1900;
strncpy (version_hdr->stamp, "VeRsIoN#", 8);
}
+/* start-sanitize-powerpc-netware */
+
+ /* Resolve the stubs we build for PowerPC NetWare. */
+ powerpc_resolve_stubs (inbfd, outbfd);
+/* end-sanitize-powerpc-netware */
/* Copy over the sections. */
bfd_map_over_sections (inbfd, copy_sections, (PTR) outbfd);
return "nlm32-sparc";
case bfd_arch_alpha:
return "nlm32-alpha";
+/* start-sanitize-powerpc-netware */
+ case bfd_arch_powerpc:
+ return "nlm32-powerpc";
+/* end-sanitize-powerpc-netware */
default:
fprintf (stderr, "%s: no default NLM format for %s\n",
program_name, bfd_printable_arch_mach (arch, mach));
alpha_mangle_relocs (outbfd, insec, relocs_ptr, reloc_count_ptr,
contents, contents_size);
break;
+/* start-sanitize-powerpc-netware */
+ case bfd_arch_powerpc:
+ powerpc_mangle_relocs (outbfd, insec, relocs_ptr, reloc_count_ptr,
+ contents, contents_size);
+ break;
+/* end-sanitize-powerpc-netware */
default:
default_mangle_relocs (outbfd, insec, relocs_ptr, reloc_count_ptr,
contents, contents_size);
(*relocs)->address += insec->output_offset;
}
}
+/* start-sanitize-powerpc-netware */
+
+/* We keep a linked list of stubs which we must build. Because BFD
+ requires us to know the sizes of all sections before we can set the
+ contents of any, we must figure out which stubs we want to build
+ before we can actually build any of them. */
+
+struct powerpc_stub
+{
+ /* Next stub in linked list. */
+ struct powerpc_stub *next;
+
+ /* Symbol whose value is the start of the stub. This is a symbol
+ whose name begins with `.'. */
+ asymbol *start;
+
+ /* Symbol we are going to create a reloc against. This is a symbol
+ with the same name as START but without the leading `.'. */
+ asymbol *reloc;
+
+ /* The TOC index for this stub. This is the index into the TOC
+ section at which the reloc is created. */
+ unsigned int toc_index;
+};
+
+/* The linked list of stubs. */
+
+static struct powerpc_stub *powerpc_stubs;
+
+/* This is what a stub looks like. The first instruction will get
+ adjusted with the correct TOC index. */
+
+static unsigned long powerpc_stub_insns[] =
+{
+ 0x81820000, /* lwz r12,0(r2) */
+ 0x90410014, /* stw r2,20(r1) */
+ 0x800c0000, /* lwz r0,0(r12) */
+ 0x804c0004, /* lwz r2,r(r12) */
+ 0x7c0903a6, /* mtctr r0 */
+ 0x4e800420, /* bctr */
+ 0, /* Traceback table. */
+ 0xc8000,
+ 0
+};
+
+#define POWERPC_STUB_INSN_COUNT \
+ (sizeof powerpc_stub_insns / sizeof powerpc_stub_insns[0])
+
+#define POWERPC_STUB_SIZE (4 * POWERPC_STUB_INSN_COUNT)
+
+/* Each stub uses a four byte TOC entry. */
+#define POWERPC_STUB_TOC_ENTRY_SIZE (4)
+
+/* The original size of the .got section. */
+static bfd_size_type powerpc_initial_got_size;
+
+/* Look for all undefined symbols beginning with `.', and prepare to
+ build a stub for each one. */
+
+static void
+powerpc_build_stubs (inbfd, symbols_ptr, symcount_ptr)
+ bfd *inbfd;
+ asymbol ***symbols_ptr;
+ unsigned int *symcount_ptr;
+{
+ asection *stub_sec;
+ asection *got_sec;
+ unsigned int got_base;
+ unsigned int i;
+ unsigned int symcount;
+ unsigned int stubcount;
+
+ /* Make a section to hold stubs. We don't set SEC_HAS_CONTENTS for
+ the section to prevent copy_sections from reading from it. */
+ stub_sec = bfd_make_section (inbfd, ".stubs");
+ if (stub_sec == (asection *) NULL
+ || ! bfd_set_section_flags (inbfd, stub_sec,
+ (SEC_CODE
+ | SEC_RELOC
+ | SEC_ALLOC
+ | SEC_LOAD))
+ || ! bfd_set_section_alignment (inbfd, stub_sec, 2))
+ bfd_fatal (".stubs");
+
+ /* Get the TOC section, which is named .got. */
+ got_sec = bfd_get_section_by_name (inbfd, ".got");
+ if (got_sec == (asection *) NULL)
+ {
+ got_sec = bfd_make_section (inbfd, ".got");
+ if (got_sec == (asection *) NULL
+ || ! bfd_set_section_flags (inbfd, got_sec,
+ (SEC_DATA
+ | SEC_RELOC
+ | SEC_ALLOC
+ | SEC_LOAD
+ | SEC_HAS_CONTENTS))
+ || ! bfd_set_section_alignment (inbfd, got_sec, 2))
+ bfd_fatal (".got");
+ }
+
+ powerpc_initial_got_size = bfd_section_size (inbfd, got_sec);
+ got_base = powerpc_initial_got_size;
+ got_base = (got_base + 3) &~ 3;
+
+ stubcount = 0;
+
+ symcount = *symcount_ptr;
+ for (i = 0; i < symcount; i++)
+ {
+ asymbol *sym;
+ asymbol *newsym;
+ char *newname;
+ struct powerpc_stub *item;
+
+ sym = (*symbols_ptr)[i];
+
+ /* We must make a stub for every undefined symbol whose name
+ starts with '.'. */
+ if (bfd_asymbol_name (sym)[0] != '.'
+ || bfd_get_section (sym) != &bfd_und_section)
+ continue;
+
+ /* Make a new undefined symbol with the same name but without
+ the leading `.'. */
+ newsym = (asymbol *) xmalloc (sizeof (asymbol));
+ *newsym = *sym;
+ newname = (char *) xmalloc (strlen (bfd_asymbol_name (sym)));
+ strcpy (newname, bfd_asymbol_name (sym) + 1);
+ newsym->name = newname;
+
+ /* Define the `.' symbol to be in the stub section. */
+ sym->section = stub_sec;
+ sym->value = stubcount * POWERPC_STUB_SIZE;
+ sym->flags = BSF_LOCAL;
+
+ /* Add this stub to the linked list. */
+ item = (struct powerpc_stub *) xmalloc (sizeof (struct powerpc_stub));
+ item->start = sym;
+ item->reloc = newsym;
+ item->toc_index = got_base + stubcount * POWERPC_STUB_TOC_ENTRY_SIZE;
+
+ item->next = powerpc_stubs;
+ powerpc_stubs = item;
+
+ ++stubcount;
+ }
+
+ if (stubcount > 0)
+ {
+ asymbol **s;
+ struct powerpc_stub *l;
+
+ /* Add the new symbols we just created to the symbol table. */
+ *symbols_ptr = (asymbol **) xrealloc ((char *) *symbols_ptr,
+ ((symcount + stubcount)
+ * sizeof (asymbol)));
+ *symcount_ptr += stubcount;
+ s = &(*symbols_ptr)[symcount];
+ for (l = powerpc_stubs; l != (struct powerpc_stub *) NULL; l = l->next)
+ *s++ = l->reloc;
+
+ /* Set the size of the .stubs section and increase the size of
+ the .got section. */
+ if (! bfd_set_section_size (inbfd, stub_sec,
+ stubcount * POWERPC_STUB_SIZE)
+ || ! bfd_set_section_size (inbfd, got_sec,
+ (got_base
+ + (stubcount
+ * POWERPC_STUB_TOC_ENTRY_SIZE))))
+ bfd_fatal ("stub section sizes");
+ }
+}
+
+/* Resolve all the stubs for PowerPC NetWare. We fill in the contents
+ of the output section, and create new relocs in the TOC. */
+
+static void
+powerpc_resolve_stubs (inbfd, outbfd)
+ bfd *inbfd;
+ bfd *outbfd;
+{
+ bfd_byte buf[POWERPC_STUB_SIZE];
+ unsigned int i;
+ unsigned int stubcount;
+ arelent **relocs;
+ asection *got_sec;
+ arelent **r;
+ struct powerpc_stub *l;
+
+ if (powerpc_stubs == (struct powerpc_stub *) NULL)
+ return;
+
+ for (i = 0; i < POWERPC_STUB_INSN_COUNT; i++)
+ bfd_put_32 (outbfd, (bfd_vma) powerpc_stub_insns[i], buf + i * 4);
+
+ got_sec = bfd_get_section_by_name (inbfd, ".got");
+ assert (got_sec != (asection *) NULL);
+ assert (got_sec->output_section->orelocation == (arelent **) NULL);
+
+ stubcount = 0;
+ for (l = powerpc_stubs; l != (struct powerpc_stub *) NULL; l = l->next)
+ ++stubcount;
+ relocs = (arelent **) xmalloc (stubcount * sizeof (arelent *));
+
+ r = relocs;
+ for (l = powerpc_stubs; l != (struct powerpc_stub *) NULL; l = l->next)
+ {
+ arelent *reloc;
+
+ /* Adjust the first instruction to use the right TOC index. */
+ bfd_put_32 (outbfd, (bfd_vma) powerpc_stub_insns[0] + l->toc_index, buf);
+
+ /* Write this stub out. */
+ if (! bfd_set_section_contents (outbfd,
+ bfd_get_section (l->start),
+ buf,
+ l->start->value,
+ POWERPC_STUB_SIZE))
+ bfd_fatal ("writing stub");
+
+ /* Create a new reloc for the TOC entry. */
+ reloc = (arelent *) xmalloc (sizeof (arelent));
+ reloc->sym_ptr_ptr = &l->reloc;
+ reloc->address = l->toc_index + got_sec->output_offset;
+ reloc->addend = 0;
+ reloc->howto = bfd_reloc_type_lookup (inbfd, BFD_RELOC_32);
+
+ *r++ = reloc;
+ }
+
+ bfd_set_reloc (outbfd, got_sec->output_section, relocs, stubcount);
+}
+
+/* Adjust relocation entries for PowerPC NetWare. We do not output
+ TOC relocations. The object code already contains the offset from
+ the TOC pointer. When the function is called, the TOC register,
+ r2, will be set to the correct TOC value, so there is no need for
+ any further reloc. */
+
+/*ARGSUSED*/
+static void
+powerpc_mangle_relocs (outbfd, insec, relocs_ptr, reloc_count_ptr, contents,
+ contents_size)
+ bfd *outbfd;
+ asection *insec;
+ register arelent ***relocs_ptr;
+ bfd_size_type *reloc_count_ptr;
+ char *contents;
+ bfd_size_type contents_size;
+{
+ const reloc_howto_type *toc_howto;
+ bfd_size_type reloc_count;
+ register arelent **relocs;
+ register bfd_size_type i;
+
+ toc_howto = bfd_reloc_type_lookup (insec->owner, BFD_RELOC_PPC_TOC16);
+ if (toc_howto == (reloc_howto_type *) NULL)
+ abort ();
+
+ /* If this is the .got section, clear out all the contents beyond
+ the initial size. We must do this here because copy_sections is
+ going to write out whatever we return in the contents field. */
+ if (strcmp (bfd_get_section_name (insec->owner, insec), ".got") == 0)
+ memset (contents + powerpc_initial_got_size, 0,
+ (bfd_get_section_size_after_reloc (insec)
+ - powerpc_initial_got_size));
+
+ reloc_count = *reloc_count_ptr;
+ relocs = *relocs_ptr;
+ for (i = 0; i < reloc_count; i++)
+ {
+ arelent *rel;
+ asymbol *sym;
+ bfd_vma symvalue;
+
+ rel = *relocs++;
+ sym = *rel->sym_ptr_ptr;
+
+ /* We must be able to resolve all PC relative relocs at this
+ point. If we get a branch to an undefined symbol we build a
+ stub, since NetWare will resolve undefined symbols into a
+ pointer to a function descriptor. */
+ if (rel->howto->pc_relative)
+ {
+ /* This check for whether a symbol is in the same section as
+ the reloc will be wrong if there is a PC relative reloc
+ between two sections both of which were placed in the
+ same output section. This should not happen. */
+ if (bfd_get_section (sym) != insec->output_section)
+ fprintf (stderr, "%s: unresolved PC relative reloc against %s\n",
+ program_name, bfd_asymbol_name (sym));
+ else
+ {
+ bfd_vma val;
+
+ assert (rel->howto->size == 2 && rel->howto->pcrel_offset);
+ val = bfd_get_32 (outbfd, (bfd_byte *) contents + rel->address);
+ val = ((val &~ rel->howto->dst_mask)
+ | (((val & rel->howto->src_mask)
+ + (sym->value - rel->address)
+ + rel->addend)
+ & rel->howto->dst_mask));
+ bfd_put_32 (outbfd, val, (bfd_byte *) contents + rel->address);
+
+ /* If this reloc is against a symbol whose name begins
+ with a `.', and the next instruction is
+ cror 31,31,31
+ then we replace the next instruction with
+ lwz r2,20(r1)
+ This reloads the TOC pointer after a call. */
+ if (bfd_asymbol_name (sym)[0] == '.'
+ && (bfd_get_32 (outbfd,
+ (bfd_byte *) contents + rel->address + 4)
+ == 0x4ffffb82)) /* cror 31,31,31 */
+ bfd_put_32 (outbfd, (bfd_vma) 0x80410014, /* lwz r2,20(r1) */
+ (bfd_byte *) contents + rel->address + 4);
+
+ --*reloc_count_ptr;
+ --relocs;
+ memmove (relocs, relocs + 1,
+ (size_t) ((reloc_count - 1) * sizeof (arelent *)));
+ continue;
+ }
+ }
+
+ /* When considering a TOC reloc, we do not want to include the
+ symbol value. The symbol will be start of the TOC section
+ (which is named .got). We do want to include the addend. */
+ if (rel->howto == toc_howto)
+ symvalue = 0;
+ else
+ symvalue = sym->value;
+
+ /* If this is a relocation against a symbol with a value, or
+ there is a reloc addend, we need to update the addend in the
+ object file. */
+ if (symvalue + rel->addend != 0)
+ {
+ bfd_vma val;
+
+ switch (rel->howto->size)
+ {
+ case 1:
+ val = bfd_get_16 (outbfd,
+ (bfd_byte *) contents + rel->address);
+ val = ((val &~ rel->howto->dst_mask)
+ | (((val & rel->howto->src_mask)
+ + symvalue
+ + rel->addend)
+ & rel->howto->dst_mask));
+ if ((bfd_signed_vma) val < - 0x8000
+ || (bfd_signed_vma) val >= 0x8000)
+ fprintf (stderr,
+ "%s: overflow when adjusting relocation against %s\n",
+ program_name, bfd_asymbol_name (sym));
+ bfd_put_16 (outbfd, val, (bfd_byte *) contents + rel->address);
+ break;
+
+ case 2:
+ val = bfd_get_32 (outbfd,
+ (bfd_byte *) contents + rel->address);
+ val = ((val &~ rel->howto->dst_mask)
+ | (((val & rel->howto->src_mask)
+ + symvalue
+ + rel->addend)
+ & rel->howto->dst_mask));
+ bfd_put_32 (outbfd, val, (bfd_byte *) contents + rel->address);
+ break;
+
+ default:
+ abort ();
+ }
+
+ rel->sym_ptr_ptr = bfd_get_section (sym)->symbol_ptr_ptr;
+ rel->addend = 0;
+ }
+
+ /* Now that we have incorporated the addend, remove any TOC
+ relocs. */
+ if (rel->howto == toc_howto)
+ {
+ --*reloc_count_ptr;
+ --relocs;
+ memmove (relocs, relocs + 1,
+ (size_t) ((reloc_count - i) * sizeof (arelent *)));
+ continue;
+ }
+
+ rel->address += insec->output_offset;
+ }
+}
+/* end-sanitize-powerpc-netware */
\f
/* Name of linker. */
#ifndef LD_NAME
projects / binutils-gdb.git / commitdiff